CN211816452U - Underground garage backfill soil foundation post-cast strip seals earlier and constructs structure afterwards - Google Patents

Abstract

The utility model relates to a post-pouring zone construction structure, in particular to a post-pouring zone of an underground garage backfilling foundation, which is closed first and then constructed. Solve the technical problem that the post-casting zone affects the construction progress and project quality in the garage ground construction. Including the foundation foundation, a post-casting belt area is arranged on the foundation foundation, and side cover plates are arranged on both sides of the post-casting belt area. There is an upper cover plate on the side cover plate, a reserved hole is arranged on the upper cover plate, a concrete pouring pipe is arranged in the reserved hole, and a backfill soil layer is arranged on the foundation, and the upper pipe of the concrete pouring pipe is arranged The mouth is provided with a baffle plate, and the upper mouth of the concrete pouring pipe is higher than the backfill soil layer. It can effectively solve the problem of closing the foundation post-cast zone when backfilling the basement in advance, ensure the construction quality of the post-cast zone in the later stage, and speed up the project progress as a whole, while reducing the difficulty of backfill construction and basement structure construction.

Description

Underground garage backfill foundation post-poured belt is closed first and then construction structure

technical field

The utility model relates to a post-pouring zone construction structure, in particular to a post-pouring zone of an underground garage backfilling foundation, which is closed first and then constructed.

Background technique

In recent years, in the structural design, the technical measures of setting post-casting belts have been adopted in view of the common quality problem that the structure is too long and prone to concrete cracks. The post-casting belt has the characteristics of long retention time, large quantity, many processes and high construction quality requirements.

In the ground construction of the underground garage, under normal circumstances, the post-casting zone of the foundation settlement should be poured after the construction age is reached. The backfilling of the atrial heart of the basement can only be carried out after the construction of the foundation post-pouring zone. If the atrial heart backfill needs to be carried out in advance, a retaining wall must be built along the post-pouring zone. Backfill construction is difficult, and the progress of the project will also be delayed. The reserved post-pouring zone of the underground garage is located at

In the prior art, some processing techniques for post-cast strips are disclosed. For example, CN 209082573 U discloses a pre-closed structure for pouring after settling. CN 209323574 U discloses a pre-sealed basement roof settlement and post-casting belt structure. All have proposed the idea of using a cover plate to cover the upper side of the post-casting belt to form the space of the post-casting belt.

SUMMARY OF THE INVENTION

In order to solve the technical problem that the post-pouring zone affects the construction progress and engineering quality during the ground construction of the garage, the utility model provides an underground garage backfill foundation post-pouring zone which is closed first and then constructed.

The technical scheme of the utility model is that a post-pouring zone of the backfill foundation of an underground garage is closed first and then constructed, including a foundation foundation, a post-pouring zone is arranged on the foundation foundation, and a left side cover is arranged on both sides of the post-pouring zone. plate, right cover, the left cover and right cover are connected and fixed by a pair of pull screws, there is a steel mesh between the left cover and the right cover, and the left cover and the right cover are The cover plate is provided with an upper cover plate, a reserved hole is arranged on the upper cover plate, a concrete pouring pipe is arranged in the reserved hole, a backfill soil layer is arranged on the foundation, and the upper nozzle of the concrete pouring pipe is provided with a stopper The upper nozzle of the concrete pouring pipe is higher than the backfill soil layer.

The upper cover plate is provided with a lifting ring. The spacing between the reserved holes is not more than 1 meter, and the diameter is not less than 200mm.

In order to ensure the strength of the upper cover plate, the width of the upper cover plate is not more than 1000mm, the length is not more than 1500mm, and the thickness is not less than 100mm.

The width of the upper cover plate is larger than the width of the post-casting zone, the two sides of the upper cover plate and the joints on the surface of the foundation are provided with slope-shaped sealing belts, and the joints between the concrete pouring pipe and the upper cover plate are provided. There is a slope-shaped sealing tape. It can prevent impurities from leaking into the post-casting zone during the backfilling process.

The method of use is to make a concrete prefabricated cover plate, set side cover plates on both sides of the post-casting belt, and the inner side of the side cover plate needs to be chiseled. Reinforcement mesh is set in the pouring belt space, and the upper cover plate is placed on it to form the post-pouring belt space. Concrete pouring pipes are installed in the holes of the upper cover plate, and then the backfill operation is performed on the foundation. After backfilling to the design height, concrete pouring begins. The pipe pours the concrete into the post-pouring zone space to complete the entire operation process.

The garage of the utility model adopts the structure of first sealing the foundation post-casting belt and then constructing it, which can effectively solve the problem of closing the foundation post-casting belt when the basement atrium is backfilled in advance, ensure the construction quality of the post-casting belt in the later stage, and accelerate the progress of the project as a whole. At the same time, it can reduce the difficulty of backfill construction and basement structure construction.

Description of drawings

Fig. 1 is the structural representation of the utility model

Figure 2 is a schematic diagram of the structure of the upper cover

In the picture: 1- left cover plate, 2- pair of pull screws, 3- steel mesh, 4- baffle plate, 5- concrete pouring pipe, 6- upper cover plate, 7- right cover plate, 8- backfill soil layer , 9- foundation foundation, 10- post-casting zone, 11- lifting ring, 12- reserved hole.

Detailed ways

As shown in FIG. 1 , a post-pouring zone of an underground garage backfill foundation is closed first and then constructed, including a foundation foundation 9, a post-pouring zone 10 is arranged in the foundation foundation 9, and left and right sides of the post-pouring zone 10 are arranged The side cover 1, the right cover 7, the left cover 1 and the right cover 7 are connected and fixed by the pull screw 2, and a steel mesh is provided between the left cover 1 and the right cover 7 3. An upper cover 6 is arranged on the left cover 1 and the right cover 7, and a reserved hole 12 is arranged on the upper cover 6, and a concrete pouring pipe 5 is arranged in the reserved hole 12. A backfill soil layer 8 is set on the top, a baffle plate 4 is provided on the upper nozzle of the concrete pouring pipe 5 , and the upper nozzle of the concrete pouring pipe 5 is higher than the backfill soil layer 8 .

As shown in FIG. 2 , the upper cover plate 6 is provided with a lifting ring 11 . The spacing between the reserved holes 12 is not more than 1 meter, and the diameter is not less than 200mm.

In order to ensure the strength of the upper cover plate, the width of the upper cover plate 6 is not more than 1000mm, the length is not more than 1500mm, and the thickness is not less than 100mm.

The width of the upper cover plate 6 is greater than the width of the post-casting zone 10, the two sides of the upper cover plate 6 and the joints of the foundation surface are provided with slope-shaped sealing belts, and the concrete pouring pipe 5 and the upper cover plate are 6 There is a slope-shaped sealing tape at the seam. It can prevent impurities such as soil from leaking into the post-pouring zone during the backfilling process.

The distance between the upper nozzle of the concrete pouring pipe 5 and the backfill soil layer 8 is not less than 300mm.

specific construction process

There are two kinds of precast concrete cover plate with perforated plate and without perforated plate. The precast concrete cover plate with holes is divided into holes in the plate and holes at the edge of the plate. The prefabricated plate without holes is the same as the prefabricated plate with holes except that there is no reserved round hole in the middle.

The width of the precast concrete cover plate is determined according to the width of the post-casting belt, which is generally 200mm larger than the width of the post-casting belt; the length is determined according to the construction drawings and the actual situation on site, and should not exceed 1500mm to facilitate manual and reliable installation, and the thickness is 100mm. The cover plate is equipped with a single-layer two-way steel mesh φ10@150, and it is poured with self-mixing c20 fine stone concrete.

Two φ12 rings should be set on the surface of the precast concrete cover to facilitate hoisting. The foundation beams and the prefabricated cover plates on the side of the outer wall shall be left with the eyelets of the pulling screws for fixing. A circular hole with a diameter of 200mm (the size can be adjusted according to the actual situation) is reserved on the prefabricated cover plate as the installation position of the feeding pipe.

The sealing net in the post-casting belt needs to be removed, the concrete surface needs to be chiseled, and the sundries such as concrete blocks inside the post-casting belt need to be cleaned up. After adjustment, the steel mesh in the pouring belt should be straight, regular, and fully buckled. After the adjustment is completed, the concealed acceptance is carried out, and the cover plate can be installed only after passing the test.

The prefabricated upper cover is laid by tower crane, transportation and manual installation. Due to the complex infrastructure around the main building, the laying sequence must be laid in strict accordance with the position shown in the layout drawing. After laying, drill holes for positioning steel bars at a distance of 1m along the edge of the cover plate to prevent the position of the cover plate from shifting during the backfilling process.

After the prefabricated cover is laid, splayed feet (R≥50mm) should be made along the root of the cover, and the joints on the surface of the cover should be plastered and plugged to prevent soil from flowing into the post-pouring zone during the backfilling process.

After the prefabricated cover plate is laid, the concrete pouring pipeline shall be installed. The upper opening of the pipeline shall be no less than 300mm above the design elevation of the backfill. Cut out the corresponding length of thin-walled iron pipe in advance according to the design elevation and insert it into the reserved hole. , After adjusting the verticality of the pipeline, the root should be fixed with splayed feet (R≥100mm), and the upper opening of the pipeline should be closed, and the upper opening should be covered with a multi-layer board to make a buckle cover to prevent the earthwork from entering the post-pouring zone during the backfilling process. Inside.

For backfill construction, manual backfill should be used between the prefabricated concrete feed pipes and within 2m from the other direction of the concrete feed pipes, and the prefabricated pipes should not be disturbed; After the temperature rises in the next year, the backfill needs to be compacted twice, and the compaction coefficient of the backfill is ≥0.93.

The post-poured strip concrete is poured by the "free-fall method". When the post-casting belt is poured, the slump of the concrete needs to be appropriately increased, which is conducive to the flow of the concrete inside the post-casting belt and enhances the compactness, or uses self-compacting concrete for pouring. When pouring the post-casting belt, pour continuously from both sides of the post-casting belt to the center. The vibrating rod is used to assist the vibrating from the pouring port to promote the flow and spreading of the concrete. Generally, reciprocating pouring is required, and at the same time, the distance from the pouring port to the nozzle is measured with a tape measure, and the concrete pouring height is calculated according to the length of the embedded pipe. Ensure that the final pouring height in each interval blanking hole is 100mm below the completion surface of the underground garage floor, and ensure the concrete density of the post-pouring zone. Concrete curing, pouring is completed, pour water into the concrete pouring pipe within 12 hours after the completion of the concrete, and the pouring port should be temporarily closed with plastic cloth for curing.

The pouring port is closed. After the post-pouring belt is poured, the pipes above the concrete surface in the pouring pipeline are removed, and the surrounding concrete surface is chiseled. C20 fine stone concrete is used to pour the pit to the ground level, and the stubble end surface is flat.

Economic benefits: The unit price of backfill is expected to decrease by 2 yuan/m³, 4900m³*2 yuan/m³=9800 yuan,

The unit price of the ground cushion is expected to be reduced by 1 yuan/㎡, 6393㎡*1 yuan/㎡=6393 yuan, and the winter construction cost of the basement structure will be reduced by about 100,000 yuan. Social benefits: Through the trial of backfilling the underground garage of this project, the construction period will be shortened For 15 days, it provides a successful example for the practice of post-casting in the future project, which can be used for reference and reference.

Claims (6)

1. A construction structure after the backfilling belt of an underground garage backfill foundation is first closed and then the construction structure is characterized in that: comprising a foundation foundation (9), in the foundation foundation (9), a backwatering belt area (10) is provided, and a backwatering belt area (10) is provided in the foundation foundation (9). A left cover plate (1) and a right cover plate (7) are arranged on both sides of the area (10), and the left cover plate (1) and the right cover plate (7) are connected and fixed by a pair of pulling screws (2). A reinforcement mesh (3) is arranged between the left cover plate (1) and the right cover plate (7), and an upper cover plate (6) is arranged on the left cover plate (1) and the right cover plate (7). ), a reserved hole (12) is arranged on the upper cover plate (6), a concrete pouring pipe (5) is arranged in the reserved hole (12), and a backfill layer (8) is arranged on the foundation foundation (9), so The upper nozzle of the concrete pouring pipe (5) is provided with a baffle plate (4), and the upper nozzle of the concrete pouring pipe (5) is higher than the backfill soil layer (8). 2 . The construction structure after backfilling the foundation of the underground garage according to claim 1 is characterized in that a lifting ring ( 11 ) is provided on the upper cover plate ( 6 ). 3. The construction structure after the backfilling foundation of the underground garage according to claim 1 is characterized in that the spacing between the reserved holes (12) is not more than 1 meter and the diameter is not less than 200mm. 4. The underground garage backfill foundation post-pouring belt is closed first and then the construction structure according to claim 1 is characterized in that: the width of the upper cover plate (6) is not more than 1000mm, the length is not more than 1500mm, and the thickness is not less than 100mm . 5. The post-casting belt of the backfill foundation of the underground garage according to claim 1 is characterized in that: the width of the upper cover plate (6) is greater than the width of the post-casting belt area (10), and the Both sides of the upper cover plate (6) and the joints on the foundation surface are provided with slope-shaped sealing strips, and the joints between the concrete pouring pipe (5) and the upper cover plate (6) are provided with slope-shaped sealing strips. 6. The construction structure after the backfill foundation of the underground garage according to claim 1 is closed first and then the construction structure is characterized in that: the upper nozzle of the concrete pouring pipe (5) is not less than 300mm higher than the backfill soil layer (8).

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